Santa Claus has started his Christmas journey around the world. He made his first stops in Russia Tuesday morning. NORAD, or the North American Aerospace Defense Command, has several ways for people to track Santa.

You can follow him online or through special Santa-tracker apps for iPhone, Android, and Windows users. You can also track Santa's movements on Bing maps, on Twitter, or through a new Google Santa Tracker.

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NORAD has officially tracked Santa's travels since 1955. That year, a newspaper ad printed the wrong number for kids trying to call Santa. The number they called sent them to the agency that eventually became NORAD.

Ever since then, NORAD's command center in Colorado Spring, Colorado has offered updates on Santa's movements, first with AM radio bulletins, then on TV, and now online and through special apps.

Children around the world can also call a special hotline on Christmas Eve to find out when Santa will arrive at their homes. The hotline number is 877-HI-NORAD, or 877-446-6723.